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A device for continuously humidifying and dehumidifying feed air for a manufacturing process or a ventilation and air conditioning installation includes a membrane contactor having a membrane, the feed air being passed along one side of the membrane and a hygroscopic liquid being passed along anothe

A device for continuously humidifying and dehumidifying feed air for a manufacturing process or a ventilation and air conditioning installation includes a membrane contactor having a membrane, the feed air being passed along one side of the membrane and a hygroscopic liquid being passed along another side of the membrane. A regenerator is provided for lowering the water content of the hygroscopic liquid. A metering device is provided for adding water to increase the water content of the hygroscopic liquid. A control device is connected to the metering device and to the regenerator, the control device being configured to control the water content of the hygroscopic liquid and enable a switching between humidification and dehumidification of the feed air as a function of the water vapor partial pressure difference between the feed air and the hygroscopic liquid. A heat exchanger is provided to cool the hygroscopic liquid as the hygroscopic liquid moves from the regenerator to the membrane contactor and at the same time to heat the hygroscopic liquid as the hygroscopic liquid moves from the membrane contactor to the regenerator.

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1. An apparatus for continuously humidifying and dehumidifying feed air for a manufacturing process or a ventilation and air conditioning installation, the apparatus comprising:a membrane contactor including a membrane configured to have the feed air passed along one side of the membrane and a hygro

1. An apparatus for continuously humidifying and dehumidifying feed air for a manufacturing process or a ventilation and air conditioning installation, the apparatus comprising:a membrane contactor including a membrane configured to have the feed air passed along one side of the membrane and a hygroscopic liquid passed along another side of the membrane; a regenerator configured to lower a water content of the hygroscopic liquid; a metering device configured to add water so as to increase the water content of the hygroscopic liquid; a control device connected to the metering device and to the regenerator, the control device being configured to control the water content of the hygroscopic liquid so as to enable a switching between humidification and dehumidification of the feed air as a function of a water vapor partial pressure difference between the feed air and the hygroscopic liquid; and a heat exchanger configured to cool the hygroscopic liquid as the hygroscopic liquid moves from the regenerator to the membrane contactor and at the same time to heat the hygroscopic liquid as the hygroscopic liquid moves from the membrane contactor to the regenerator, the membrane contactor, the metering device, the regenerator and the heat exchanger being connected in a circuit for the hygroscopic liquid. 2. The apparatus as recited in claim 1 wherein the membrane is microporous and hygrophobic.3. The apparatus as recited in claim 1 wherein the membrane includes a hollow fiber configured for receiving a flow of the hygroscopic liquid therethrough.4. The apparatus as recited in claim 1 wherein the regenerator includes at least one of a second membrane contactor, a packed column and an evaporator.5. The apparatus as recited in claim 1 wherein the hygroscopic liquid includes at least one of a highly concentrated aqueous solution of a polyhydric alcohol and a highly concentrated aqueous salt solution of a hygroscopic salt with a biocidal action.6. The apparatus as recited in claim 5 wherein the highly concentrated aqueous solution of the polyhydric alcohol includes at least one of ethylene glycol and glycerol.7. The apparatus as recited in claim 5 wherein the highly concentrated aqueous salt solution of the hygroscopic salt includes at least one of lithium chloride and Kathene.8. The apparatus as recited in claim 1 further comprising at least one of a second heat exchanger connected upstream of the membrane contactor and configured to control a first temperature of the hygroscopic liquid and a third heat exchanger connected upstream of the regenerator and configured to control a second temperature of the hygroscopic liquid.9. The apparatus as recited in claim 1 wherein the membrane includes a plurality of hollow fibers disposed in a ventilation duct for the feed air, a flow in the ventilation duct impinging on the hollow fibers at an angle of less than 90°.10. The apparatus as recited in claim 9 wherein the flow in the ventilation duct impinges on the hollow fibers at an angle of between 30° and 60°.11. The apparatus as recited in claim 9 wherein the membrane contactor covers substantially an entire cross section of the ventilation duct.12. An apparatus for continuously humidifying and dehumidifying feed air for a manufacturing process or a ventilation and air conditioning installation, the apparatus comprising:a membrane contactor including a membrane configured to have the feed air passed along one side of the membrane and a hygroscopic liquid passed along another side of the membrane; a metering device configured to add water so as to increase the water content of the hygroscopic liquid, the metering device and the membrane contactor being connected in a first circuit for the hygroscopic liquid; a regenerator configured to lower a water content of the hygroscopic liquid, the regenerator being connected in a second circuit for the hygroscopic liquid; a control device connected to the metering device and to the regenerator, the control device being configured to control the water content of the hygroscopic liquid so as to enable a switching between humidification and dehumidification of the feed air as a function of a water vapor partial pressure difference between the feed air and the hygroscopic liquid; at least one first feed line configured to branch off a first partial stream from the hygroscopic liquid in the first circuit and feed the first partial stream into the second circuit; at least one second feed line configured to branch off a second partial stream from the hygroscopic liquid in the second circuit and return the second partial stream to the first circuit; and a heat exchanger, the at least one first feed line and the at least one second feed line passing through the heat exchanger. 13. The apparatus as recited in claim 12 wherein the membrane is microporous and hygrophobic.14. The apparatus as recited in claim 12 wherein the membrane includes a hollow fiber configured for receiving a flow of the hygroscopic liquid therethrough.15. The apparatus as recited in claim 12 wherein the regenerator includes at least one of a second membrane contactor, a packed column and an evaporator.16. The apparatus as recited in claim 12 wherein the hygroscopic liquid includes at least one of a highly concentrated aqueous solution of a polyhydric alcohol and a highly concentrated aqueous salt solution of a hygroscopic salt with a biocidal action.17. The apparatus as recited in claim 16 wherein the highly concentrated aqueous solution of the polyhydric alcohol includes at least one of ethylene glycol and glycerol.18. The apparatus as recited in claim 16 wherein the highly concentrated aqueous salt solution of the hygroscopic salt includes at least one of lithium chloride and Kathene.19. The apparatus as recited in claim 12 further comprising at least one of a second heat exchanger connected upstream of the membrane contactor and configured to control a first temperature of the hygroscopic liquid and a third heat exchanger connected upstream of the regenerator and configured to control a second temperature of the hygroscopic liquid.20. The apparatus as recited in claim 12 wherein the membrane includes a plurality of hollow fibers disposed in a ventilation duct for the feed air, a flow in the ventilation duct impinging on the hollow fibers at an angle of less than 90°.21. The apparatus as recited in claim 20 wherein the flow in the ventilation duct impinges on the hollow fibers at an angle of between 30° and 60°.22. The apparatus as recited in claim 20 wherein the membrane contactor covers substantially an entire cross section of the ventilation duct.